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Titel |
Parameterizing sub-surface drainage with geology to improve modeling streamflow responses to climate in data limited environments |
VerfasserIn |
C. L. Tague, J. S. Choate, G. Grant |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1027-5606
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Digitales Dokument |
URL |
Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 1 ; Nr. 17, no. 1 (2013-01-29), S.341-354 |
Datensatznummer |
250017694
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Publikation (Nr.) |
copernicus.org/hess-17-341-2013.pdf |
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Zusammenfassung |
Hydrologic models are one of the core tools used to project how water
resources may change under a warming climate. These models are typically
applied over a range of scales, from headwater streams to higher order
rivers, and for a variety of purposes, such as evaluating changes to aquatic
habitat or reservoir operation. Most hydrologic models require streamflow
data to calibrate subsurface drainage parameters. In many cases, long-term
gage records may not be available for calibration, particularly when
assessments are focused on low-order stream reaches. Consequently,
hydrologic modeling of climate change impacts is often performed in the
absence of sufficient data to fully parameterize these hydrologic models. In
this paper, we assess a geologic-based strategy for assigning drainage
parameters. We examine the performance of this modeling strategy for the
McKenzie River watershed in the US Oregon Cascades, a region where previous
work has demonstrated sharp contrasts in hydrology based primarily on
geological differences between the High and Western Cascades. Based on
calibration and verification using existing streamflow data, we demonstrate
that: (1) a set of streams ranging from 1st to 3rd order within the Western
Cascade geologic region can share the same drainage parameter set, while (2)
streams from the High Cascade geologic region require a different parameter
set. Further, we show that a watershed comprised of a mixture of High and
Western Cascade geologies can be modeled without additional calibration by
transferring parameters from these distinctive High and Western Cascade
end-member parameter sets. More generally, we show that by defining a set of
end-member parameters that reflect different geologic classes, we can more
efficiently apply a hydrologic model over a geologically complex landscape
and resolve geo-climatic differences in how different watersheds are likely
to respond to simple warming scenarios. |
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